Based on research in the field of virtual communities, most business thinkers will agree that there are 4 fundamental pillars to successful communities - content, members, member profiles and transactions. If managed properly, these 4 dynamics can lead to economics of increasing returns that characterize most successful communities. The more members you have, the more content they will create. That in turn will increase the value to the community members and attract more members. If you capture information about your members and you make it easier for them to find stuff in the community based on their profile, the higher the value of the community to the members and the more members you will attract. It's easy to understand the workings and to get the benefits of the dynamics of increasing returns that happen in successful virtual communities. Many of those were first described by business thinker and management consultant John Hagel in Net Gain more than a decade ago.

There are other aspects that drive and define communities, such as the social and technology infrastructures of communities as well as the business processes that they support. But none of those characteristics have the power to create the positive value creation loops that the original four can.

While most successful communities will have a mix of all of the ingredients - we can characterize communities by their dominant dynamic.

First there are content-based communities, where members interact with one another primarily in the context of content - either consumer generated or licensed/acquired. News sites or blogs are communities that would fall in this category.

Then there are communities that are primarily member-based. Member-driven communities can take on many different forms. Brand communities like the Harley or the Ducati communities are clearly member-centric communities, even though some companies mistakenly think that the brand is at the center of those communities, and not the members. Networking communities like LinkedIn and Facebook are clearly communities that have members at their core. Many developer communities in the tech world also fall within this category.

Lastly there are transaction-centric communities. eBay and Amazon.com come to mind when talking about those communities.

Of course, all of those communities have content, and all have members, and most have transactions - it's just that they are more heavily tilted towards one of the community ingredients than another. And in some cases communities with the same end-goal can take on very different forms. Brand communities could also be set up as content-centric communities or as transaction-centric communities. Customer support communities or developer communities could also be started as content-centric communities - and perhaps evolve into transaction-centric communities.

The reason it's important to understand the different types of communities is because of the requirements to get them started. You cannot start a member-centric or a transaction-based community without a critical mass of members or offerings - something most companies do not have. Without a critical mass of members or offerings, there will not be enough content generated (i.e., customer reviews, etc.) in order to make the interaction for the community members valuable. So if you have a total potential number of users ranging in the hundreds, you will never be able to set up a vibrant customer support community as Intuit. Microsoft or Apple can. That does not mean that you cannot leverage customer support communities, it means that you have to start them up as content-driven communities. Instead of relying on the community members to re-write your manuals and to create meaningful FAQs, you may have to hire a few people to kick-start the process on a for-hire basis.

While the economics of increasing returns may be somewhat diminished with a smaller number of members and some hired guns, they are still very much present. Most likely they will handily beat the economics of diminishing returns that most business practitioners face when trying to interact with customers and prospects in the old-fashioned interrupt-driven way.

Some of these thoughts have been triggered by the many conversations I have had the pleasure to have as part of the Community Effectiveness Study that we are conducting with Deloitte and the Society of New Communications Research. Some of the preliminary results of this study will be discussed at the Society for New Communications Research Forum in two weeks and more detailed results will be unveiled at the Community 2.0 Conference in May.